/Engine/Source/Editor/Sequencer/Public/ISequencerChannelInterface.h
Draw additional content in addition to keys for a particular channel
The new slate layer ID for subsequent elements to paint onto
int32 DrawExtra_Raw ( [FMovieSceneChannel](API\Runtime\MovieScene\Channels\FMovieSceneChannel) * InChannel, const [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * InOwner, const [FSequencerChannelPaintArgs](API\Editor\Sequencer\FSequencerChannelPaintArgs) & PaintArgs, int32 LayerId ) const